Device for positioning a cutting edge of a cutting
tool on a machine tool

ABSTRACT

A POSITIONING DEVICE IS DISCLOSED FOR POSITIONING A CUTTING TOOL AT A PREDETERMINED POSITION RELATIVE TO A REFERENCE TEMPLATE. THE CUTTING TOOL IS RIGIDLY MOUNTED ON A TOOL SLIDE WHICH CONSTITUTES PART OF A COPY LATHE. A FEELER IS POSITIONED TO CONTACT THE REFERENCE TEMPLETE AND IS MOUNTED ON THE TOOL SLIDE FOR MOVEMENT RELATIVE THERETO IN SUCH A MANNER THAT BOTH THE TOOL SLIDE AND THE CUTTING TOOL MAY BE MOVED AS A UNIT RELATIVE TO THE FEELER. THE POSITONING DEVICE COMPRISES A MOVABLE SENSOR DISPOSED IN OPPOSED, SPACED-APART RELATIONSHIP TO THE CUTTING TOOL WHEN THE FEELER IS IN CONTACT WITH THE REFERENCE TEMPLATE AND A CONTROL CIRCUIT RESPONSIVE TO THE MOVEMENT OF THE SENSOR TO EFFECT MOVEMENT OF THE TOOL SLIDE. THE CONTROL CIRCUIT COMPRISES A SWITCH ACUATED IN RESPONSE TO MOVEMENT OF THE SENSOR TO PROVIDE AN ELECTRIC SIGNAL, A COMPARATOR FOR COMPARING THE ELECTRICAL SIGNAL WITH A REFERENCE SIGNAL INDICATIVE OF THE CORRECT CUTTING TOOL POSITION AND PROVIDING A CORRESPONDING CONTROL SIGNAL, AND A MOTOR RESPONSIVE TO THE CONTROL SIGNAL TO EFFECT MOVEMENT OF THE TOOL SLIDE THEREBY ACCURATELY POSITIONING THE CUTTING TOOL.

FENSW PUHCA UNITED STATES PATENT OFFICE Published at the request of theapplicant or owner in accordance with the Notice of Dec. 18, 1969, 8690.6. 687. The abstracts of Defensive Publication applications areidentified by distinctly numbered series and are arrangedchronologically. The heading of each abstract indicates the number orpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are available to the public for inspection and reproductionmay be purchased for 30 cents a. sheet.

Defensive Publication applications have not been examined. as $0 themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED AUG. 1, 1972 T901,004 DEVICE FOR POSITIONHNG A CUTTING EDGE OFA CUTTING TOOL ON A MACHINE TOOL Ernest Schmid, Marin-Epagnier,Switzerland, assignor to Edouard Dubied 82 Cie Societe AnonyrneContinuation of application Ser. No. 800,929, Feb. 20, 1969. Thisapplication Mar. 24, 1971, Ser. No. 127,804 Claims priority, applicationSwitzerland, Feb. 28, 1968, 2,913/68 Int. Cl. 1323b 3/28 US. Cl. 8214 D2 Sheets Drawing. 6 Pages Specification A positioning device isdisclosed for positioning a cut ting tool at a predetermined positionrelative to a reference template. The cutting tool is rigidly mounted ona tool slide which constitutes part of a copying lathe. A feeler ispositioned to contact the reference template and is mounted on the toolslide for movement relative thereto in such a manner that both the toolslide and the cutting tool may be moved as a unit relative to thefccler. The positioning device comprises a movable sensor disposed inopposed, spaced-apart relationship to the cutting tool when the fecleris in contact with the reference template and a control circuitresponsive to the movement of the sensor to eifect movement of the toolslide. The control circuit comprises a switch actuated in response tomovement of the sensor to provide an electric signal, a comparator forcomparing the electrical signal with a reference signal indicative ofthe correct cutting tool position and providing a corresponding controlsignal, and a motor responsive to the control signal to effect movementof the tool slide thereby accurately positioning the cutting. tool.

E. SCHMID Aug. 1, 1972 DEVICE FOR POSITIONING A CUTTING EDGE OF ACUTTING TOOL ON A MACHINE TOOL 2 Sheets-Sheet 1 Original Filed Feb. 20,1969 Aug. 1, 1972 sc m I T9ULOQ4 DEVICE FOR POSITIONING A CUTTING EDGEOF A CUTTING TOOL ON A MACHINE TOOL Original Filed Feb. 20, 1969 2Sheets-Sheet 2

